Lubricating apparatus



Feb. 9, 1937. E. w. DAvls 2,070,003 l LUBRICATING APPARATUS Filed July7, 1934 2 Sheets-Sheet 1 i0 J5 g2.

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UNITED STATES PATENT OFFICE LUBRICATING APPARATUS corporation ofVirginia Application July 7, 1934, Serial No. 734,089

Claims.

My invention relates generally to lubricating apparatus, and moreparticularly to improvements in pressure contact nozzles for highpressure lubricating equipment.

It is an object of my invention to provide an improved high pressurelubricant tight Contact nozzle having improved means for guiding thenozzle into accurate sealing contact with the fitting attached to thepart to be lubricated.

A further object is to provide an improved means for centering thenozzle of a lubricant compressor relative to the lubricant receivingtting to Which it is applied.

Other objects will appear from the following description, reference.being had to the accompanying drawings, in which:

Fig. 1 is an elevation of a high pressure lubricant compressor, nozzle,and lubricant receiving iitting, parts of the compressor being shown incross section to show their operation;

Fig. 2 is a longitudinal sectional View of the contact nozzle showingthe parts in the position assumed as it is being applied to a lubricantreceiving tting;

Fig. 3 is an enlarged fragmentary sectional view showing the nozzle inlubricant transmitting contact with the iitting;

Fig. 4 is a longitudinal sectional view of a modifled form of nozzle;

Fig. 5 is a transverse sectional view taken on the line 5 5 of Fig. 4;

Fig. 6 is an end elevational View taken on the line 6-6 of Fig. 4; and

Fig. 7 is an enlarged fragmentary sectional Y View showing the nozzle inlubricant transmitting contact with the lubricant receiving fitting.

It is frequently very difcult properly to contact the nozzle of a highpressure grease gun with the lubricant receiving tting when the nozzlecomprises a so-called needle point, which to effect a seal with thetting must be inserted into the relatively small inlet opening in theiitting. The inlet opening of the tting may be as small as one-sixteenthof an inch in diameter. I have therefore provided an improved nozzlehaving a rectractile guide for facilitating the placing of the nozzleinto sealing contact with the tting.

As shown in Fig. 1, the improved nozzle I0 of my invention isillustrated as applied to a high pressure lubricant compressorcomprising a barrel I2 having a follower piston I4 reciprocable therein,the piston being secured to a piston rod I6 which projects from the endcap I8 of the barrel and has a pistol grip handle secured thereto. Ahigh pressure cylinder 22 is mounted for reciprocation in a guide 24secured to the lower cap 26. A plunger 28 is secured to an aperturedplate 30 held at the lower end oi' the barrel I2 by the lov/'er cap 26and forms a guide for a compression coil spring 32 which engages thehigh pressure cylinder 22 and normally holds the latter in its outerposition as indicated in Fig. 1.

In Fig. l the nozzle is shown as applied to a lubricant receivingfitting 34 threaded into the oil hole of a bearing 35. The fitting 34may be of the type shown in U. S. Patent No. 1,475,980 to O. U. Zerk, orof the type shown in the application of Joseph Bystricky, Serial No.661,713, led March `20, 1933, or any other suitable type of iittinghaving a small inlet opening adapted to be engaged by a nozzle having aso-called needle point which contacts with the edge of the nipple aboutthe inlet opening thereof.

The nozzle comprises a body 38 threaded to the end of the high pressurecylinder or discharge tube 22 and being suitably counterbored to form acylindrical chamber 4B for a compression coil spring 42 which holds aball check valve 44 against the outer end of the high pressure cylinder22. The outer end of the body 38 is reduced in diameter and terminatesin a tip 46 having a substantially spherical contact surface, the tiphaving a discharge passageway 48 formed therein. A sleeve 50 is threadedon the threaded portion 52 of the nozzle and has a flaring mouth 54adapted to aid in guiding the nozzle intor sealing contact with thefitting. Within the sleeve 50 a guide member 56 is slidably mounted, themember being normally pressed outwardly to the position in which it isshown in Fig. 2 by a compression coil spring 58. The guide member 56 isaxially bored so as to slide freely over the cylindrical reduceddiameter portion 60 of the nozzle and has a concave spherical contactsurface 62 which is adapted to engage the peripheral edge of the tip ofa lubricant receiving tting. Outward movement of the guide member 56relative to the sleeve 50 is prevented by interengagement of a slopingshoulder 54 formed Within the sleeve 50 and a complementary taperedshoulder 66 formed on the guide member 56.

In using the lubricant compressor equipped with my improved form ofnozzle the handle 20 is grasped and the nozzle pushed against thelubricant receiving fitting. As long as the nozzle is directed generallyover the tip of the fitting it Will be guided to a central position inaxial alignment with the -i'itting initially by the flaring mouth 54 ofthe sleeve 50 and secondarily bythe concave spherical surface 62 of theguide member 5B. The nozzle will thus be guided over the fitting to theposition in which it is shown in Fig. 2. Pressure upon the handle in adirection toward the fitting willthereupon cause lubricant to be fedunder low pressure from the barrel l2 into the bore of the high pressurecylinder 22. Continued application of force to the compressor will causethe barrel to move downwardly relative to the highr pressure cylinder 22causing the plunger 28 to force the contents of the tube under highpressure past the outlet check valve 44. The spring 58 in the nozzle isweaker than the spring 32 in the compressor so that prior to the timethat the plunger 28Y enters the high pressure cylinder, the guide member56 will have moved upwardly from the Y position in which it is shown inFig. 2 to the position in which it is shown in Fig. 3, thereby to permitdirect sealing contact between the rounded projection 46 of the nozzleand the edge of the lubricant receiving fitting surrounding its inletopening.

Because of the factthat the area of contact between the nozzle and thefitting is very small, being substantially line contact about a circlehaving a diameter ofv approximately il@ of an Yinch, the unit pressureis very high and a very l the sleeve havingV a flaring mouth 12 to aidin guiding the nozzle into alignment with the fitting. 'I'he nozzleproper comprises a tube 14 having a flange 18, the flange being pressedagainst a shoulder 18 by a bushing 80 threaded in the bore of the sleeve10. A gasket 82 of copper or other suitable material is interposedbetween the flange 16 and the shoulder 18 to prevent the leakage oflubricant. 'I'he bushing 80 also serves as a seat for the spring 84ofthe ball check valve 86 which forms the outlet valve of the highpressure cylinder 22. A nozzle guide member 88 is reciprocable in thelower end of the sleeve 10, being normally pressed outwardly by a coil'spring 90 compressed between the flange 16 and the guide member.

Outward movement of the guide member is limited by the Yengagement of anannular shoulder 92 formed thereon with a complementary shoulder 94formed in the bore of the sleeve 10. The guide member 88 is` suitablyapertured to receive thersmall diameter projecting portion 96 of thenozzle 14 and has a concave spherical contact surface 98 which isadapted to engage the tip of a lubricant receiving fitting and centerthe nozzle relative thereto.

Fig. 4 shows the nozzle with the parts in the position assumed uponinitial engagement, while Fig. 7 shows the nozzle in lubricanttransmitting engagementwith the lubricant receiving fitting. Theoperation of the nozzle shown in Figs. 4 to '1 inclusive issubstantially identical with the operation of the nozzle shown in Figs.1 to 3 inclusive, and need not therefore be described in detail. Thenozzle shown in Figs. 4 to 7 has the advantage that the nozzle proper 14is of rela# tively small Vsize and may therefore be economically made ofa very hard and durable metal and be suitably heat treated without greatexpense.

While I have disclosed specific embodiments of my invention, it will'bereadily understood by those skilled inY the art that variations may bemade in the construction disclosed without departing from the basicfeatures of myinvention. I therefore do not wish to be limited to theprecise construction disclosed, but wish to include Ywithin the scope ofmy invention all such modifications and variations which will readilysuggest themselves.

What I claim as new and desire to secure by United States Letters Patentis:

l. A nozzle for high pressure lubricant compressors, comprising asleeve, a small diameter nozzle part `rigid with respect to said sleeve,and a guide member mounted Within said sleeve and surrounding saidnozzle part, said guide member being reciprocable relative to saidnozzle part and sleeve, said guide member having a surface adapted toengage a lubricant receiving fitting and aid in centering the nozzleover the fitting, and a spring for urging said guide member outwardly ofsaid nozzle.

2. A nozzle for high pressure lubricating apparatus comprising, adischarge conduit, a sleeve secured to said conduit, a small diameternozzle rigidly secured within said sleeve, and spring pressed retractilemeans positioned Within Vsaid sleeve, surrounding the contact portion ofsaid nozzle, and having. a flaring surface for guiding said nozzle intoalignment with a lubricant receiving fitting. f

3. In a nozzlel for high pressure lubricant compressors, the combinationof a small diameter nozzle part, a sleevethreaded on said nozzle partand protecting the latter, Yand a spring pressed guide member mountedwithin said sleeve and reciprocable relative thereto,

said guide member having a aring surface for engaging a lubricantreceiving fitting and aiding in centering the nozzle over the fitting.

4. A nozzle for high pressure lubricating apparatus comprising, adischarge conduit, a sleeve secured tol said conduit, and having aninternal shoulder, a small diameter nozzle part rigidly secured in saidsleeve against the shoulder thereof, and spring actuated meanspositioned within said sleeve, surrounding the contact portion of saidnozzle part and having a flaring surface for guiding said nozzle intoalignment with a lubricant receiving fitting.

5. A nozzle for high pressure lubricating apparatus comprising, a smalldiameter nozzle part insertable partially into the inlet opening of alubricant receiving fitting, means slidable rela-.-

. tive to said part for aiding in centering the latter over suchfitting, a spring urging said means outwardly, and a sleeve surroundingsaid spring and said means and having means'for limiting the extent ofoutward sliding movement of said means.

ERNEST W. DAVIS.

